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A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this replaced rotary dialing , that had been developed for ...
Date/Time Thumbnail Dimensions User Comment; current: 21:30, 2 May 2007: 571 × 463 (36 KB): Sakurambo~commonswiki {{Information |Description=Telephone keypad with letter mapping corresponding to the ITU E.161 standard |Source=Created using Adobe Illustrator CS2 |Date=2 May 2007 |Author= Philip Ronan}}
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A telephone keypad using the ITU E.161 standard. Numeric keypad, integrated with a computer keyboard A calculator 1984 flier for projected capacitance keypad. A keypad is a block or pad of buttons set with an arrangement of digits, symbols, or alphabetical letters.
E.161 is an ITU-T Recommendation that defines the arrangement of digits, letters, and symbols on telephone keypads and rotary dials. It also defines the recommended mapping between the basic Latin alphabet and digits (e.g., "DEF" on 3). [1] Uses for this mapping include: Multi-tap and predictive text systems. Forming phonewords from telephone ...
Multi-tap (multi-press) [1] is a text entry system for mobile phones.The alphabet is printed under each key (beginning on "2") in a three-letter sequence as follows ...
A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence.
A typical lineman's handset integrates an earpiece, a mouthpiece, a dialing interface, and a set of test leads for connecting to the telephone circuit. Originally, lineman's handsets featured a rotary dial , but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use.